Purification of natural and regenerated caoutchoucs and other colloidal matters.



ARY. PURIHCATION OF NATURAL AND REGEHERATED C -C'UYCHUUCS AND OTHER CQLLOIDAL MATTERS.

AFPLECMEON FILED FiB. 3, i922 Patentsd A151: 26, 1915.

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a w w w M 8 AW/ 5 4/ 9 j M W? C P. BARY. PURIFELA'HON OF NATURAL AND REGENERATED CAOL'TCHOMS AND OTHER common MAIYEHS. APPHCAHGN FILED HJB. N

1,13 ,4 2, Patemed Apr. 1915.

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The apparatus shown in Figs. 1-3 Consists of a certain number of plates or frames A of wood or other material, arranged con tiguously with each other and held together so that the joints between them are ti ht b means of screw bolts B and nuts 0. The W ole apparatus recalls the arrangement of the filter press.

As shown in the detail in Fig. 3, each frame A carries two membranes D, D of caoutchouc, asbestos or other suitable material having between them a space in which is to circulate, for example, the solution to be freed from foreign substances dissolved with the colloid. The spaces between these plates communicate with each other by pipes E which connect the spaces alternately at the top and. at the bottom. By grouping the two neighboring plates there remain other empty spaces between the membranes belonging to diii'erent plates. These latter spaces communicate with each other through perforations F, F in the frames and serve for circulation of the liquid which is to receive the substances diffused through the membranes D, D.

When the object is to remove from solutions of caoutchouc the sulfur which they contain, for example if the solution of caoutchouc introduced into the apparatus in the direction of the arrow .22 (Fig. 3) the solvent should enter in the direction of the arrow 3 so that the movement of the two liquids on each side of the membrane D, D should. bring about as much as possible a systematic extraction.

Should an accident occur to one of the membranes, which accident would be immediately observed at the delivery end owing to the partial. mixing of the two liquids, the damaged part can be detected for the purpose of dismounting and repairing it by tests made on samples withdrawn through the cooks I in the lower connecting pipes E.

In the modification shown in Big. 4, the porous surfaces are tubes K of porous material arranged between two tube plates N M, which constitute the bottom and top respectively of chambers Q and P. The solution of caoutchouc enters as indicated by arrow on, rises through the tubes and leaves at :12, while the solvent enters at y and leaves at 7 It is to be remarked that the exchanges which occur between the liquids on each side of the membrane do not produce differences of hydrostatic pressure but only differences 0]". osmotic pressure and that in consequence what happens is in no way comparable with a simple filtration.

By way of example of the treatment of another material than caoutchouc it may be mentioned that a colloidal solution of acetyl caoutchouc containing impurities, to dialysis.

L. A process of purilying -aoutchtmc, nch. filiflipllfi ili circulating a solution of side of a dialyaing membrane, ing a solvent on the ther he lyaing membrane, whereby impurities are separated from said sciutiou of cauotchouc by dialysis.

3. A. process of purifying caoutchouc, which comprises circulating a sciut hydrocarbon of caoutchom; containing impurities on one side of a dialyzing meme brane, and circulating the pure hydrocarbon solvent on the other side of said dialyzing membrane.

4. A process of purifying caoutchouc, which comprises circulating a solution of caoutchouc containing impurities on one side of a dialyzing membrane, and circulating a solventon the other side of said dialyzing membrane in a reverse direction, whereby impurities are separated from said solution of caoutchouc by dialysis.

5. A process of purifying caoutchouc, which comprises subjecting a solution of caoutchouc containing" impurities to dialysis through a caoutchouc mei'nhrane.

6. An apparatus for purifying caoutchouc, comprising a liquid container and a dial '1.

ing membrane in said container adapted to separate a solution to be purified from a solvent in said container whereby dialysis may take place through said membrane, said membrane cmnprising caoutchouc.

7. An apparatus for purifying caoutchouc, comprising a liquid container and a dialyzing membrane in said container adapted to separate a solution to be purified from a solvent in said unitainer, whereby dialysis may take place through said membrane, said membrane comprising caoutchouc and porous supports for said caoutchouc.

8. An apparatus for purifying caoutrhouc, comprising a liquid container and a dialyzing membrane in. said mntam r adapted to separate a solution to be purified from a solvent in said container, whereby dialysis may" take place through said membrane, said membrane comprising porous material impregnated with cacutchouc.

9. An apparatus for purifying caoutcnouc,

iu'tchouc ci'iutaining impurities. on one comprisin a frame havin dialyzing diamy name in the presence of two subscribmg phragms t erein, said diap ragms compriswltnesses.

mg caoutchouc and ada ted to separate a CHARLES PAUL BARY. "Solution between them rom a solution on Witnesses: 5 the outside of said die hragms. H. G. Coxn,

In witness whereof, I ave hereunto signed RENIE BARDY. 

